ラット摘出肺の肺胞上皮を介した水分輸送におけるNa`+´-グルコース共輸送の関与

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  • Role of Na+-Glucose Cotransport in Fluid Absorption Across Alveolar Epithelium in Isolated Rat Lungs.

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To evaluate the role of Na+-glucose cotransport in fluid absorption across alveolar epithelial walls in isolated rat lungs, we measured the inhibitory effects of amiloride (a Na+ channel blocker) and phlorizin (a Na+-glucose cotrasport blocker) on the fluid absorption rate in fluid-filled lungs. Amiloride (10-5-10-4M) reduced alveolar fluid absorption by 30%. This value was similar to that obtained in the presence of 10-3 M phlorizin. The coefficient of Na+-glucose cotransport was estimated to be 2.5. The strong correlation between Na+ escape and fluid absorption (r=0.907) was not affected by phlorizin. These findings suggest that the impact of Na+-glucose cotransport was similar to that of Na+ transport alone, and that glucose molecules transported by Na+-glucose cotransport do not play an important role in alveolar fluid absorption across rat alveolar epithelium.

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